When I ran update I got this
"Failed to fetch http://mozilla.debian.net/dists/squeeze ... ts/Release Unable to find expected entry iceweasel-4.0/binary-i386/Packages in Meta-index file (malformed Release file?)
Some index files failed to download, they have been ignored, or old ones used instead."
Do I have a problem and can it be cured?

what besenmuckel showed you is the a factoid key. Just type this as message in IRC and our bot will answer with some instructions. Kano cares about the most important keys, e.g. !iceweasel - so they are up-to-date. The wiki article about IRC usage, I showed you some time before too, if you are not familiar with IRC, it should be a good lecture how to use it

Cheers TheOne

PS: btw the reason for this message is that the iceweasel 4.0 repository is not reachable anymore - maybe you noticed the iceweasel/firefox versioning story, I hope that ends soon